Milling machine



FIG. 1 is a front elevational view of my milling machine showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view taken from the left side of FIG. 1;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a side elevational view taken from the right side of FIG. 1. 

The ornamental design for a milling machine, as shown and described. 